Corrosive resistant and laser engraved every 120 degrees. Improved access. SureGrip hex design drives the side of the fastener, not the corner. Made in the U.S.A.. Lifetime warranty The ball swivel allows the socket to turn freely without binding and the 30 flex angle provides improved access. Made in the U.S.A. Sockets with SureGrip Hex Design - The patented SureGrip hex design drives the side of the fastener, not the corner. This not only provides increased strength, but also avoids the rounding of rusted or damaged fasteners, which can occur when using a sharp cornered hex tool. This universal joint is 0.91" in diameter and 1.92" in length.